feat: introduce pydantic-settings for config definition and validation (#5202)

Co-authored-by: -LAN- <laipz8200@outlook.com>

api/configs/middleware/__init__.py

@@ -0,0 +1,43 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+from configs.middleware.redis_configs import RedisConfigs
+
+
+class StorageConfigs(BaseModel):
+    STORAGE_TYPE: str = Field(
+        description='storage type,'
+                    ' default to `local`,'
+                    ' available values are `local`, `s3`, `azure-blob`, `aliyun-oss`, `google-storage`.',
+        default='local',
+    )
+
+    STORAGE_LOCAL_PATH: str = Field(
+        description='local storage path',
+        default='storage',
+    )
+
+
+class VectorStoreConfigs(BaseModel):
+    VECTOR_STORE: Optional[str] = Field(
+        description='vector store type',
+        default=None,
+    )
+
+
+class KeywordStoreConfigs(BaseModel):
+    KEYWORD_STORE: str = Field(
+        description='keyword store type',
+        default='jieba',
+    )
+
+
+class MiddlewareConfigs(
+    # place the configs in alphabet order
+    KeywordStoreConfigs,
+    RedisConfigs,
+    StorageConfigs,
+    VectorStoreConfigs,
+):
+    pass

api/configs/middleware/redis_configs.py

@@ -0,0 +1,38 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field, NonNegativeInt, PositiveInt
+
+
+class RedisConfigs(BaseModel):
+    """
+    Redis configs
+    """
+    REDIS_HOST: str = Field(
+        description='Redis host',
+        default='localhost',
+    )
+
+    REDIS_PORT: PositiveInt = Field(
+        description='Redis port',
+        default=6379,
+    )
+
+    REDIS_USERNAME: Optional[str] = Field(
+        description='Redis username',
+        default=None,
+    )
+
+    REDIS_PASSWORD: Optional[str] = Field(
+        description='Redis password',
+        default=None,
+    )
+
+    REDIS_DB: NonNegativeInt = Field(
+        description='Redis database id, default to 0',
+        default=0,
+    )
+
+    REDIS_USE_SSL: bool = Field(
+        description='whether to use SSL for Redis connection',
+        default=False,
+    )